Also known as TPD1 protein homolog 1 (TPD1-like protein 1) (AtTDL1).A microRNA MIR400 is derived from the first intron of At1g32583 in the 5'UTR. A stress-induced alternative splicing event in At1g32583 resulted in greater accumulation of miR400 primary transcripts and a low level of mature miR400.

Also known as TPD1 protein homolog 1A (Protein MICROSPORELESS 2) (TPD1-like protein 1A) (OsTDL1A).Involved in cell specification during anther development. Required for the differentiation of primary parietal cells into secondary parietal cells in anthers (PubMed:22913653). May serve as an extracellular ligand for the MSP1 receptor kinase to limit sporocyte number in ovules (PubMed:18248596).